Pump for lubricating systems.



'E. WOERNER.

PUMP FOR LUBRIGATING SYSTEMS.

APPLICATION FILED SEP T. 12, 1910.

Patented Nov. 18, 1913.

2 SHEBTSSKEET 1.

WIT/758356 21.. 1% 6; i

STATES uric EUGEN WOERNER, 0F CANNSTATI, GERMANY, ASSIGNOR TO THE FIRM 01? ROBERT BOSCH, OF STUTTGABT, GERMANY.

PUMP rout LUBRICA'TING s'Y's'rEMs.

Specification of Letters Patent.

Patented Nov. 18', 1913.

Application filed September 12', 1910.- Serial No: 581,479.

To all whom it may concern:

Be it known that I, EUGEN VVOERNER, a subject of the Emperor of Germany, of Cannstatt, Germany, have invented certain new and useful Improvements in Pumps for Lubricating Systems; and I do hereby declare the following to be a full, clear,'and eXa-ct description of the invention, such as will enable others skilledin the art to which it appertains to makeiand use the same.

The invention relates to lubricating pumps adapted to force the lubricant into conduits which lead to the places to be lubricated.

It consists in imparting to the pump pistons, in addition to the reciprocating motion necessary for their suction and forcing func-' tions, a rotary motion, which is made use of to regulate the distribution of the lubricant to the pump.

The special forms or modifications of the invention hereinafter described, presuppose an arrangement wherein a plurality of cups are set up in a circle about a driving shaft common to them all. The reciprocating movement of the pistons is attained in this arrangement, by providing the heads of the pistons with crank-slides, which engage the rim ofan inclined disk mounted upon the driving shaft; and the rotary motion can likewise be imparted to the pump pistons by appropriate projections from the outer periphery of the inclined disk. In the drawings, Figure 1 is a vertical section through a lubricating pump embodying the invention; Fig. 2 is a top. planview, partly in section; Fig. '3 is a sectional plan of a modified form of pump plunger and surrounding casing; and Figs. and 5 show a modified form of the pump, Fig. 4 being a. vertical section on the line 44 of Fig. 5, and Fig. 5 a horizontal section on the line 5-5 of Fig. 4.

Upon the driving shaft A the disk 0 is clamped fast in an inclined position. Its rim projects between the flanges 1),, at the upper ends of the pistons b and other flanges periphery of the inclined disk 0 at the highest and lowest point in the direction of the axis are provided appropriate teeth or lugs d al which are so chosen that they engage with the cogged surfaces of the sleeves 8,. In the walls of the cylinders a, within which work the pistons b, are arranged two suctionopenings f and f and, at the lower ends of the pistons, grooves g and g, are provided. The grooves are spaced apart upon the periphery of the pistons by 90. Below each piston is a check valve 4) through which the pump is connected to a nipple t, to which the lubricating conduit is attached.

The device operates as follows: At the instant of time indicated, the tooth (Z upon a half revolution of the inclined disk the tooth d engages the cogs on sleeve s and imparts to the piston a further one eighth revolution, and just at the moment at which the piston finds itself at its upper dead point. Consequently, the surface lying between t-he two grooves is caused to cover the aperture f, so that the space below the piston is cut off from communication with the oil receptacle 0. At the following force stroke of the piston the oil that has been taken in will be forced through the check valve '0 into the lubricating conduit. At the beginning of the second suction stroke the tooth 03 again engages the cogs on sleeve 8 revolves the piston a further one-eighth of a complete revolution, and consequently brings the grooveg into communication with the aperture 7'. At the beginning of the second force stroke, the fourth revolving of the in-011445 follows, so that it has now revolved half a complete revolution and has again closed bqth suction apertures f and f At the beginning of the third suction stroke the groove 9 again registers With the suction aperture 7",. A. closing of both suction apertures follows and then the v groove 9 registers with the suction aperture f so that after the completion of the fourth force stroke, all of the parts again assume the position illustrated and the same operation begins anew.

Instead of having but two grooves g and 9,, four can be located about the entire periphery of the piston, and these would correspond to four suction openings f, as shown in Fig. 3. In that case, at the beginning of each suction stroke, all four grooves would register with the four suction apertures and, at the beginning of each force stroke all four of the suction apertures would be closed.

In the modification of the invention shown in Figs. 4 and 5, the inclined disk 0 upon the driving shaft A is mounted thereon eccentrically and the yokes h at the upper ends of the pistons b extend laterall so far that the periphery of the inclined isk can project over the central axis of the pistons. All of the yokes h are enveloped by a ring 7", which rests loosely upon the lugs 0 which may be cast upon the interior surface of the walls of the oil receptacle 0. In like manner as in the modification shown in Figs. 1 and 3, grooves g are arranged at the lower end of the pistons, which grooves, by 001- respondingly revolving the piston, are caused. to register with suction openings f in the pump cylinders. A nipple t having a check valve 1) is likewise provided, for connection with the lubricating conduit.

The operation of the device shown in Figs. 4 and 5 is apparent. The inner diameter of the ring r is so chosen that the yokes h fit between the ring and the periphery of the disk in such manner that the edges of the yokes m at the periphery of the disk and the edges 3 at the inner periphery of the ring 1" are in loose contact with the said ring and disk when the crank-slides are correspondingly oblique. The disk being revolved through the agency of the driving shaft A, the crank-slides and with them the pistons receive an oscillating motion in con sequence of the eccentricity of the disk 0. Simultaneously, the pistons, because of the inclined position of the disk 0, are moved up and down in the direction of their axes. The grooves g on the lower ends of the pistons and the suction apertures f in the pump cylinders are so spaced that the space beneath the piston is connected with the oil receptacle during the suction stroke, and (through the check valve 0) with the nipple t during the force stroke.

The modifications shown in Figs. 4 and 5 plication, Serial No. 652,519, filed October 3, 1911.

WVhat I claim is 1. Force pump mechanism for lubricating systems comprising a plurality of cylinders having oil. passages therein, pistons within said cylinders and containing oil ducts each arranged in a straight line longitudinally of its piston, and mechanism common to all of the pumps for reciprocating the pistons, said pistons and said mechanism having cooperative means whereby each piston is given step-by-step rotary movements in the same direction to bring. the oil duct therein into register with the respective oil passage when the piston is being reciprocated in one direction and out of register when the piston is being reciprocated in the other direction substantially as described.

2.Force-pump mechanism for lubricating systems comprising a plurality of cylinders having oil passages therein and arranged concentrically about a common center, pistons within said cylinders and containing oil ducts, an inclined disk mounted for rotation about said common center and engaging the pistons'to reciprocate them, and means whereby the rotation of the inclined disk imparts periodic rotary movements to the pistons to bring the oil ducts therein into register with the oil passages when the pistons are moving in one direction and out of register with said passages when the pistons are moving in the other direction; substantially as described.

3. Force-pump mechanism for lubricating systems comprising a plurality of cylinders having oil passages therein and arranged concentrically about a common center, pistons within said cylinders and containing oil ducts, an inclined disk mounted for rotation about said common center and engaging the pistons to reciprocate them, projections on the periphery of said disk, and cogs engaged by said projections and connected to the pistons to impart periodic rotary movements thereto to bring the oil ducts therein into register with the oil passages when the pistons are moving in one direction and out of register with said passages when the pistons are moving in the opposite direction; substantially as described. 7

In testimony whereof I aflix my signature, in presence of two witnesses.

EUGEN WOERNER. 

